Voltage inverter response to grid voltage and frequency changes in renewable stations

hello, I need the advise about inverters of voltage. How does the invertors react to increase or decrease of voltage and frequency of power grid. This question is about renewable source electric station. I'm looking for books, website's, or more

Hi Sergey-What you're describing is called a grid tie inverter.  Generally speaking, the frequency of the power grid is very stable, so the inverter can easily synchronize with it. As for voltage- the voltage of the grid usually doesn't change much either, but by making a subtle changes in output voltage the inverter can either feed power back to the grid, or at least reduce the amount of power drawn from the grid. It is very important that this type of inverter detects that grid power has failed an must either shut down gracefully or at least isolate itself from the grid to avoid feeding power out during a time when linemen my be working to restore service.Searching the Internet will turn up lots of information about these inverters, but you might want to start with  Wikipedia.-Rick

thanks for information , but i work with electric grid, that has unstable frequency ( fluctuation is about 1-5%) and the react on this fluctuation is very important 

Hi Sergey- I responded a couple of days ago, but my post seems to have disappeared, so here it is again.I am realizing that you are probably talking about much larger inverters than what I had in mind. Most of the principles are still the same, but I think the biggest unknown is how will they react to a frequency change of 5%.  I don't know the answer to that, but I could certainly see the grid becoming unstable if this is not properly addressed. I'm thinking that your best resource will be the manufacturer of these inverters.  Doing a search of "wind farm inverters"turns up several, most notably ABB .-Rick